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(NOModeL) o L. W. SUTTON, Jr.

Transmitting Telephone.

No. 229,489. Patented June 29,1980.

N- PEI'ERS.'FHOTO UTHDGRAPHER. WASHINGTON. D C,

UNITED STATES PATENT OFFICE.

LYMAN W. SUTTON, JR, OF NEWTON, N. J., ASSIGNOR OF FOUR-FIFTHS OF HISRIGHT TO FANNIE L. MATTISON, WM. M. SMITH, AND CHAS. A. SMITH, OF SAMEPLACE, AND WILLIAM MOMURTRIE, OF WASHINGTON, D. O.

TRANSMlTTlNG-TELEPHON E.

SPECIFICATION forming part of Letters Patent No. 229,489, dated June 29,1880.

Application filed March 31, 1880.

To all whom it may concern Beit known that I, LYMAN W. SUTTON, J r., acitizen of the United States, residing at Newton, in the county ofSussex and the State of New Jersey, have invented a new and usefulImprovement in Transmitting Telephones; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,reference being had to the accompanying 1o drawing, and the letters ofreference marked thereon,which forms apart of this specification.

My invention relates to that portion of transmitting-telephones whicheffects and completes the transfer and transformation of the undu- I 5lations produced by sound to corresponding undulations in the electricor voltaic current passing through the instrument, and has for itsobject to simplify the construction and increase the durability of theinstrument and its efiectiveness in operation.

To attain this object I make use of the com bination and constructionillustrated in the drawing hereinbefore mentioned, in which A is aplate, of wood or other suitable substance,

having a perforation, B, made trumpet-shaped to concentrate -the wavesof sound that must pass through it to the metallic diaphragm X preparedto receive them, placed immediately behind it, and held in place againsta suitable o shoulder by a second plate of wood or other suitablesubstance, E, attached to the plate A by means of the screws I I. Bothplates are chambered to give place to and secure the diaphragm and otherparts. To the center 3 5 of the back of the diaphragm X, and directlyopposite to the center of the trumpet-shaped opening or mouth-piece B,is attached a small block of gas-retort'carbon, O. Directly opposite tothis carbon, andin the back plate, E, is 40 a cylindrical perforation,forming a collar, of proper caliber to admit of the free passage andmotion without friction of a metallic plunger, D, with pointed platinumtips attached to each (No model.)

end ofit-and introduced within thesaid perforation. Outside the backplate, E,and directly 5 opposite to the perforation and the plunger 1),

is a second block of gas-retort carbon attached to a strong metallicadjustment-bar, F, which serves to effect the proper contact of theplunger and the two carbon blocks, and which is operated from the frontby means of the set or adjustment screw G. The platinum-tipped metallicplunger acts as a connection between the two carbons. The wires H H,attached, respectively, to the metallic diaphragm X and theadjustmentbar F, serve to complete the current from the battery throughthe several parts of the instrument. The freedom of backward-and-forwardmotion thus provided for, the platinum-tipped plunger reduces theiesistance to the vibration produced by the impact of sound-waves uponthe diaphragm X, and thus favors increased distinctness of theundulation in the conveying current and consequently in thearticulations of the receivinginstrument. The platinum tips remove thepossibility of derangement of this portion of the instrument byoxidation and destruction of-the electrical contact with the carbons.

The special form and substance of the inclosing-case are notparticularly material to my invention, and may be modified as desired.

What I claim as my invention, and desire to secure by Letters Patent, is

The platinum -tipped plunger D, acting be- 7 tween and in connectionwith the carbons c c to secure a maximum simplicity and cheapness ofconstruction, durability, and perfection in transmission ofarticulations.

In testimony whereof I have hereunto set my hand this 26th day of March,1880.

LYMAN W. SUTTON, J n.

Witnesses:

W. R. MATTISON, GEORGE B. SMITH.

